#ifndef STACK_H
//--------Define Creating a Sequence Stack-------------------------------------//
PSeqStack createEmptyStack_seq(int);
//--------Define Checking whether a Sequence Stack is empty--------------------//
int isEmptyStack_seq(PSeqStack);
//--------Define Pushing an element ("x") into a Sequence Stack ("pastack")----//
void push_seq(PSeqStack, DataType);
//--------Define Poping an element out from a Sequence Stack ("pastack")-------//
void pop_seq(PSeqStack);
//--------Define getting Top element out from a Sequence Stack ("pastack")-----//     
DataType top_seq(PSeqStack);
#endif
